That's one of the things we used to do during our annual pizza seminar when I was at the AIB (prior to my retirement).
Actually, its pretty easy to do, yes you do need to use pre-cooked meat. The pepperoni was a very popular one that we made using ground pepperoni. If you would like to discuss in detail please feel free to contact me directly at 785-537-1037. Be sure to email me <thedoughdoctor@hotmail.com> letting me know when you are planning to call so I can be at my desk to take your call.
Tom Lehmann/The Dough Doctor